This is my honest feedback after about 5 hours of gameplay:
I know you recommend a controller but you got to have better starting keybinds for keyboard. I changed mine to movement on W,A,S,D and block, set and dive to K, O, P as it felt more natural because movement is maybe for most people second nature to have on W,A,S,D and then with your fast paced game it isn't possible to have action buttons asinged to the same fingers.
The timing for receiving and setting is a little unforgiving and even more so if you want to do a longer set because you have to perfect your trajectory too.
PLEASE FIX THIS : Even the most advanced robot ( lvl 9 ) tries to spike the ball from 5 meters out after you dive for the ball and it goes to the net. Maybe he should send the ball over by jumping and setting the ball to the other teams corner.
The serve mashine in the training dosen't work ( it spawns a ball that just drops on the floor and gets right back up as it resets and the cycle repeats ).
In the training the icons for actions and movement are a little too small.
Make it so that there are buttons for everything so that you can select each one with the mouse.
Kind of a hard request, but can you please add multiplayer by any chance, please.